Also, Arduino is a neat project for the visuals, but I can't see it being very useful until we write good software for the Tacchi that can interface with the Arduino in neat ways based on user interaction.

Are you thinking about using Ardour code on the Android platform, then? Otherwise, we'd need to have some Linux distro running on a VM instead. Or port some of the code to Windows, but that would suck since it all has to do with audio.